Where do you work that a single sysadmin manages 3000 VMs?
I gave a 5 min lightning talk about this a couple of years back: https://pretalx.com/devconf-cz-2024/talk/SN93LG/
People talking here about Proxmox make me laugh.
We have a (what I thought was) large nutanix setup at $dayjob for epic emr... we have like 10-12 sysadmins for ~500 servers (end user apps, and backend infra like Citrix), and even that seems like a lot.